/*** 下拉刷新/上拉加载更多 组件(Scroller)*/
import React, {Component} from 'react';
import {StyleSheet,Text,View,ListView,ActivityIndicator,RefreshControl,
} from 'react-native';export default class Scroller extends Component {// 构造函数constructor(props) {super(props);this.state = {//}}render() {const { dataSource, renderRow, isRefreshing } = this.props;// console.log(this.props);return (<View style={styles.container}>{/*列表数据*/}<ListView// 数据源dataSource={dataSource}// 从数据源(dataSource)中接受一条数据，以及它和它所在section的IDrenderRow={renderRow}// 页头与页脚会在每次渲染过程中都重新渲染(允许在ListView底部增加一栏,便于显示加载动画)renderFooter={this._renderFooter.bind(this)}// 当所有的数据都已经渲染过，并且列表被滚动到距离最底部不足onEndReachedThreshold个像素的距离时调用onEndReached={this._fetchMoreData.bind(this)}// 调用onEndReached之前的临界值，单位是像素。(预加载)onEndReachedThreshold={20}// 隐藏右侧滚动条showsVerticalScrollIndicator={false}// finished warning : in next release ...enableEmptySections={true}// 自动调整迁移内容// 导航栏或标签栏或工具栏不覆盖 Scrollview 内容// 去除默认定位间距automaticallyAdjustContentInsets={false}// 下拉刷新refreshControl={<RefreshControl// 是否刷新refreshing={isRefreshing}onRefresh={this._onRefresh.bind(this)}tintColor={"#ff6600"}title={"拼命加载中..."}/>}/></View>)}/*** 下拉刷新*/_onRefresh() {// console.log('下拉刷新');if (this.props.isRefreshing || !this._hasMore()) {return}// 向后台发送 '0',告知刷新操作this.props.fetchData(0);}/*** 加 _ 代表私有方法* 上拉加载更多*/_fetchMoreData() {// console.log('上拉加载更多');/*** this._hasMore() 验证还有更多数据* isLoadingTail true/false 加载动画(菊花图)*/if (!this._hasMore() || this.props.isLoadingTail) {return}let page = this.props.cachedResults.nextPage;this.props.fetchData(page);}/*** 验证还有更多数据*/_hasMore() {return this.props.cachedResults.items.length !== this.props.cachedResults.items.total;}/*** 底部加载动画 及 没有更多数据文本(ListView底部增加一栏,便于显示加载动画)*/_renderFooter() {if (!this._hasMore() && this.props.cachedResults.total !== 0) {return (<View style={styles.loadingMore}><Text style={styles.loadingText}>没有更多了</Text></View>)}if (!this.props.isLoadingTail) {return (<View style={styles.loadingMore}></View>)}// 菊花图return (<ActivityIndicator style={styles.loadingMore}/>)}}// 样式
const styles = StyleSheet.create({container: {flex: 1,backgroundColor: '#F5FCFF',},// 菊花图loadingMore: {marginVertical: 20},// 文案样式loadingText: {color: '#777',textAlign: 'center'}
});

/*** 视频列表页*/
import React, {Component} from 'react';
import {StyleSheet,Text,View,ImageBackground,ListView,TouchableHighlight,Alert,Dimensions,ActivityIndicator,RefreshControl,
} from 'react-native';
// 下拉刷新/上拉加载更多组件
import Scroller from '../../components/Scroller';
// 图标
import Icon from 'react-native-vector-icons/Ionicons';
// item 组件
import CreationItem from '../../components/CreationItem';
import config from '../../common/config';
import request from '../../common/request';let {width} = Dimensions.get("window");// 缓存列表中所有数据
let cachedResults = {nextPage: 1, // 下一页items: [], // listview 数据(视频列表)total: 0 // 总数
};export default class List extends Component {// 构造函数constructor() {super();let ds = new ListView.DataSource({// 比较两条数据是否是一样的,来判断数据是否发生改变rowHasChanged: (r1, r2) => r1 !== r2});this.state = {dataSource: ds.cloneWithRows([]),isLoadingTail: false, // loading?isRefreshing: false // refresh?}}render() {return (<View style={styles.container}>{/*顶部标题栏*/}<View style={styles.header}><Text style={styles.headerTitle}>列表页面</Text></View>{/*列表数据*/}<Scroller// 数据源dataSource={this.state.dataSource}// 渲染item(子组件)renderRow={this._renderRow.bind(this)}// 是否可以刷新isRefreshing={this.state.isRefreshing}// 是否可以加载更多isLoadingTail={this.state.isLoadingTail}// 请求数据fetchData={this._fetchData.bind(this)}// 缓存列表数据cachedResults={cachedResults}/></View>)}// 生命周期-组件挂载完毕 请求数据componentDidMount() {this._fetchData(1);}// 请求数据_fetchData(page) {let that = this;if (page !== 0) { // 加载更多操作this.setState({isLoadingTail: true});} else { // 刷新操作this.setState({isRefreshing: true});// 初始哈 nextPagecachedResults.nextPage = 1;}request.get(config.api.base + config.api.creations, {accessToken: 'abc'})// data 变化的新数据.then((data) => {if (data.success) {// 保存原数据let items = cachedResults.items.slice();if (page !== 0) { // 加载更多操作// 数组拼接items = items.concat(data.data);cachedResults.nextPage += 1;} else { // 刷新操作// 数据不变items = data.data;}cachedResults.items = items; // 视频列表数据cachedResults.total = data.total; // 总数setTimeout(function () {if (page !== 0) { // 加载更多操作that.setState({isLoadingTail: false,dataSource: that.state.dataSource.cloneWithRows(cachedResults.items)});} else { // 刷次操作that.setState({isRefreshing: false,dataSource: that.state.dataSource.cloneWithRows(cachedResults.items)});}}, 1000);}}).catch((error) => {if (page !== 0) { // 上拉加载更多操作this.setState({isLoadingTail: false});} else {this.setState({ // 刷新操作isRefreshing: false});}console.error(error);});}// 列表 Item_renderRow(row) {const { navigation } = this.props;return (<CreationItemnavigation={navigation}key={row.id} // 子组件唯一性row={row}/>)}
}// 样式
const styles = StyleSheet.create({container: {flex: 1,backgroundColor: '#F5FCFF',},// 头部样式header: {paddingTop: 25,paddingBottom: 12,backgroundColor: '#ee735c',},// 头部title样式headerTitle: {color: '#fff',fontSize: 16,textAlign: 'center',fontWeight: '600'},// 菊花图loadingMore: {marginVertical: 20},// 文案样式loadingText: {color: '#777',textAlign: 'center'}
});